US7017554B2 - Fuel supply device of an internal combustion engine - Google Patents

Fuel supply device of an internal combustion engine Download PDF

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US7017554B2
US7017554B2 US11/038,440 US3844005A US7017554B2 US 7017554 B2 US7017554 B2 US 7017554B2 US 3844005 A US3844005 A US 3844005A US 7017554 B2 US7017554 B2 US 7017554B2
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fuel
closing
pressure chambers
opening
thinned
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US20050161024A1 (en
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Xiumei Wang
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Denso Corp
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Denso Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D33/00—Controlling delivery of fuel or combustion-air, not otherwise provided for
    • F02D33/003—Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/08—Introducing corrections for particular operating conditions for idling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/3809—Common rail control systems
    • F02D41/3836—Controlling the fuel pressure
    • F02D41/3845—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/04—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F02M59/102—Mechanical drive, e.g. tappets or cams
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366—Valves being actuated electrically
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • F02M63/0275—Arrangement of common rails
    • F02M63/028—Returnless common rail system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/03—Fuel-injection apparatus having means for reducing or avoiding stress, e.g. the stress caused by mechanical force, by fluid pressure or by temperature variations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails

Definitions

  • the present invention relates to a fuel supply device of an internal combustion engine.
  • a typical fuel supply device of an internal combustion engine mounted in a vehicle includes a fuel pump.
  • fuel is pressurized and a mist is sprayed via an injector.
  • a common-rail type internal combustion engine having a common rail for storing fuel to be supplied to the injector that has been pressurized in advance is widely known.
  • the fuel is forced from the fuel pump to the common rail.
  • Such fuel supply devices are disclosed Laid-Open Japanese Patent Application Publication No. 9-222056 and Laid-Open Japanese Patent Application Publication No. 2000-18052.
  • the fuel pump includes a pressure chamber.
  • the volume of the pressure chamber is expanded and contracted by the power of the engine.
  • Fuel having a relatively low pressure is introduced into the pressure chamber.
  • the fuel is discharged during a contraction process in which the volume of the pressure chamber is contracted.
  • the fuel is sealingly stored in the pressure chamber by closing an opening/closing valve at a predetermined time. Then, with the contraction of the volume of the pressure chamber, the fuel in the pressure chamber is forced out.
  • a plurality of pressure chambers is provided, each of which is expanded and contracted at different times from other pressure chambers.
  • a control unit controls the opening/closing valve so that the closing time is set in accordance with the fed quantity of fuel that is required.
  • Putting the closing time ahead so as to seal the fuel in the pressure chamber when the volume of the pressure chamber is large increases the fed quantity of fuel.
  • delaying the closing time so as to seal the fuel in the pressure chamber when the volume of the pressure chamber is small reduces the fed quantity of fuel.
  • the pressure of the fuel in the common rail is detected and then the fed quantity of fuel that is required is set in such a manner that the detected pressure is a target pressure.
  • a cam that operates by the power of the engine achieves expansion and contraction of the volume of the pressure chamber.
  • the contraction rate of the volume of the pressure chamber depends on the shape of the cam. In general, the contraction rate has a peak in the latter half of the contraction process in which the volume of the pressure chamber is contracted.
  • the present invention was made in view of the circumstances described above. It is an object of the present invention to provide a fuel supply device of an internal combustion engine that can easily reduce a driving torque and energy consumption by devising a control over the fuel supply device, not by improving the structure of the fuel supply device itself.
  • a fuel supply device of an internal combustion engine comprises: a fuel pump including a plurality of pressure chambers each having a volume that is expanded and contracted by a power of the engine and a plurality of opening/closing valves, provided to correspond to the plurality of pressure chambers in one-to-one correspondence, for opening and closing the pressure chambers, respectively, an expansion time and a contraction time of the pressure chamber being different from those of another pressure chamber, the fuel pump being operable to seal fuel stored in the pressure chambers by closing the opening/closing valves and supply the fuel in the pressure chambers with contraction of the volumes of the pressure chambers; and a controller for setting closing times of the opening/closing valves in accordance with required quantity of the fuel to be force fed.
  • the controller is operable to switch control of the opening/closing valves between a normal control in which all of the plurality of pressure chambers force the fuel sequentially and a thinned-out control in which forcing the fuel is thinned out by stopping closing of a part of the opening/closing valves out of the plurality of opening/closing valves to place the fuel in the pressure chamber in a non-pressurized state.
  • the contraction rate In a contraction process in which the volume of the pressure chamber of the fuel pump is contracted, the contraction rate has a peak in the latter half of the contraction process. At this peak, the driving torque is also larger.
  • the force fed fuel In the thinned-out control, for a part of the pressure chambers, the force fed fuel is thinned out.
  • the pressure chamber for which the force fed fuel is not thinned out is burdened with the thus thinned out feed.
  • the closing time of the opening/closing valve is put ahead.
  • part of the force fed fuel can be preformed in a period in which the driving torque is relatively smaller, not in a period in which the driving torque is larger.
  • the driving torque is substantially zero. Therefore, the driving torque of the fuel supply device can be reduced.
  • the configuration described above is set to perform a transition control in which the closing time of the opening/closing valve of the pressure chamber for which the forcing of fuel has been thinned out is initially delayed to forcedly feed small quantity of the fuel and is then gradually put ahead to increase the forced feed quantity of the fuel, immediately after switching from the thinned-out control to the normal control.
  • the configuration described above is set to perform another transition control in which the closing time of the opening/closing valve of the pressure chamber for which the forced feed of the fuel is to be thinned out is gradually delayed to gradually reduce the forced feed amount of the fuel, immediately before switching from the normal control to the thinned-out control.
  • the controller is set to determine a degree of a request of the forcing of the fuel at the present time and immediately after the present time based on an operating state of the internal combustion engine and to select the thinned-out control in an operating state in which the degree of the request of the forced feed of the fuel is weak.
  • the thinned-out control can be performed in an appropriate operating state.
  • FIG. 1 is a schematic diagram of a fuel supply device of the present invention applied to a diesel engine
  • FIG. 2 is a side view of a fuel pump of the fuel supply device of FIG. 1 ;
  • FIG. 3 is a cross-sectional view of the fuel pump of FIG. 2 taken along the line III—III of FIG. 2 ;
  • FIG. 4 is a flowchart of a control process performed by an ECU of the fuel supply device of FIG. 1 ;
  • FIG. 5A is a timing chart of a normal control operation of the fuel supply device of FIG. 1 ;
  • FIG. 5B is a timing chart of a reduction control operation of the fuel supply device of FIG. 1 ;
  • FIG. 6 is a timing chart of a transition control operation of the fuel supply device of FIG. 1 .
  • FIG. 1 shows the structure of a diesel engine (hereinafter, simply referred to as engine) as a contraction-ignition type internal combustion engine to which a fuel supply device of the present invention is applied.
  • engine a diesel engine
  • An engine body 10 includes a plurality of cylinders.
  • Injectors 11 , 12 , 13 , and 14 are provided to correspond to the cylinders of the engine body 10 in one-to-one correspondence.
  • Each of the injectors 11 , 12 , 13 , and 14 is opened and sprays fuel at a predetermined time for a predetermined period by control of an ECU 31 .
  • the injectors 11 , 12 , 13 , and 14 are opened by electromagnetic valves 111 , 121 , 131 , and 141 provided for the injectors 11 , 12 , 13 , and 14 , respectively. Fuel is injected during a period approximately corresponding to the period in which each electromagnetic valve is driven.
  • the engine body 10 has a typical structure and also includes a component that is not shown, such as an inlet and exhaust valve provided for each cylinder.
  • Fuel supply to the injectors 11 – 14 is provided by a common rail 24 .
  • a fuel pump 22 is connected via a high-pressure fuel supply tube 23 .
  • low-pressure fuel pumped from a fuel tank 21 is force fed to the common rail 24 .
  • the fuel pressure in the common rail 24 (hereinafter, referred to as common-rail pressure, if necessary) determines the injection pressure of the injectors 11 – 14 .
  • the fuel pump 22 includes a feed pump part 221 that pumps fuel from the fuel tank 21 and a fuel feed part 222 that force feeds the fuel to the common rail 24 .
  • the structure of the fuel feed part 222 is described with reference to FIGS. 2 and 3 .
  • the fuel feed part 222 includes two pumps 4 a and 4 b (hereinafter, the pump 4 a is called as the first pump 4 a , and the pump 4 b is called as the second pump 4 b ).
  • the first pump 4 a and the second pump 4 b have substantially the same structure.
  • FIG. 3 shows a cross-section of the first pump 4 a .
  • a plunger 42 a is held in a cylinder 41 a to be freely slidable therein.
  • the cylinder 41 a is arranged in such a manner that the length direction thereof is coincident with a vertical direction.
  • the space defined by a bore face of the cylinder 41 a and an upper end face of the plunger 42 a forms a pressure chamber 402 a .
  • a sliding element 54 a and a cam roller 53 a are provided on the lower end of the plunger 42 a .
  • the cylinder 41 a of the pump 4 a , 4 b is horizontally arranged.
  • a pump rotation shaft 51 is provided below the cylinder 41 a and extends along the arranged direction of the cylinder 41 a .
  • the pump rotation shaft 51 is integrated with a cam 52 a for vertically reciprocating the plunger 42 a .
  • the plunger 42 a is vertically reciprocated by the power of the engine that is transmitted to the pump rotation shaft 51 at a predetermined reduction ratio, thereby expanding and contracting the volume of the pressure chamber 402 a .
  • the cam 52 a has three cam lobes at intervals of 120 degrees on the pump rotation shaft 51 . Rotation of the pump rotation shaft 51 by 120 degrees corresponds to one period of vertical reciprocation of the plunger 42 a .
  • a phase difference corresponding to the rotation of the pump rotation shaft 51 by 60 degrees is set between the cam 52 a for the first pump 4 a and a cam (not shown) for the second pump 4 b .
  • the plunger 42 a of the first pump 4 a and the plunger 42 b of the second pump 4 b alternately vertically reciprocate.
  • the pump rotation shaft 51 transmits the power for driving the feed pump 221 , in addition to the power for the fuel feed part 222 .
  • the fuel pumped by the feed pump 221 flows through an external filter (not shown) and is introduced into the pressure chamber 402 a via an entrance 401 (shown in FIG. 2 ).
  • a PCV 43 a that serves as an opening/closing valve is provided to face the pressure chamber 402 a .
  • a second PCV 43 b is also provided atop the second pump 4 b , as shown in FIG. 2 . While the PCV 43 a is opened, the pressure chamber 402 a is in communication with the fuel tank 21 . The fuel in the pressure chamber 402 a is discharged to a return path 404 a and is then returned to the fuel tank 21 via a return outlet 405 a . This occurs with upward movement of the plunger 42 a caused by lifting of the cam lobe of the cam 52 a .
  • the check valve 44 a is a non-return valve that communicates with the high-pressure fuel supply tube 23 at its outlet. In the check valve 44 a , a direction from the pressure chamber 402 a toward the common rail 24 is set to the forward direction.
  • the check valve 44 a includes a spring 441 a for defining a discharge pressure.
  • the PCVs 43 a and 43 b are electromagnetic valves that are opened and closed by control of the ECU 31 .
  • a period in which fuel is force fed is a period from the closing of the PCV 43 a until when the plunger 42 a reaches the top dead center.
  • the closing time of the PCV 43 a moves ahead, the period of force feeding the fuel becomes longer.
  • the closing time of the PCV 43 a , 43 b is delayed, that period becomes shorter.
  • the characteristics of the change of the driving torque in the longest period of the force fed fuel which is achieved by setting the closing time of the PCV 43 a , 43 b to the earliest time, depends on the upward moving rate of the plunger 42 a defined by the shape of the cam lobe of the cam 52 a .
  • the upward moving rate of the plunger 42 a defined by the shape of the cam lobe has a peak near the top dead center of the plunger 42 a .
  • the aforementioned change of the driving torque has characteristics in which the change is small at the early stage of the period in which the cam lobe of the cam 52 a is lifted (hereinafter, simply referred to as cam lifting period, if necessary) and increases near the end of the cam lifting period.
  • cam lifting period hereinafter, simply referred to as cam lifting period, if necessary
  • the ECU 31 controls respective parts of the engine, such as the injectors 11 – 14 , based on an operating state of the engine that is determined from sensors provided in the respective parts of the engine.
  • a rotation speed sensor 32 for detecting a speed of rotation of the engine hereinafter, referred to as engine rotation speed, if necessary
  • a throttle position sensor 33 for detecting an opening degree of an intake throttle valve hereinafter, referred to as throttle opening degree
  • a pressure sensor 34 for detecting the common-rail pressure is attached to the aforementioned common rail 24 .
  • sensors attached to a typical engine are also provided.
  • the ECU 31 is formed mainly by a microcomputer.
  • the ECU 31 calculates a target injection quantity based on the operating state including the throttle opening degree and sets the aforementioned energization period that defines the opening period of the injectors 11 – 14 .
  • the present engine can be controlled by an auto-cruise control and when a driver has selected the auto-cruise mode, the target injection quantity is set to make the speed of the vehicle the same as the set speed.
  • the ECU 31 calculates the quantity of the fuel to be force fed for making the pressure detected by the pressure sensor 34 the same as a target pressure and controls the PCVs 43 a and 43 b of the fuel pump 22 while regarding the calculated feed quantity as required feed quantity.
  • the target pressure is calculated based on the operating state that is known from the aforementioned sensors.
  • FIG. 4 is a flowchart of a control over the PCVs 43 a and 43 b .
  • This routine is run for every predetermined crank angle.
  • Step S 101 it is determined whether or not the injection quantity Q of fuel is equal to or smaller than a reference value QLMT.
  • the injection quantity Q is an injection quantity per one stroke of the cylinder of the engine body 10 and can be calculated based on a value of an injection-quantity instruction. If the answer to Step S 101 is yes, it is then determined in Step S 102 whether or not the change amount ⁇ Q of the injection quantity Q (hereinafter, referred to as injection-quantity change amount) is equal to or smaller than a reference value ⁇ QLMT.
  • injection-quantity change amount ⁇ Q is a difference between the previous injection quantity Q and the current injection quantity Q.
  • Step S 102 If the answer in Step S 102 is yes, then a cylinder reduction control serving as a thinned-out control is selected in Step S 104 . If the answer in Step S 102 is no however, a normal control is selected in Step S 105 . Details of the cylinder reduction control and the normal control are described later.
  • Step S 101 determines whether or not the auto-cruise control is operating. If yes in Step S 103 , the routine goes to Step S 102 as described before. If no in Step S 103 , the routine goes to Step S 105 as described before.
  • FIGS. 5A and 5B show energization instructions to the PCVs 43 a and 43 b and lifting of the cams of the pumps 4 a and 4 b .
  • shaded regions in the cam lifting chart present periods in which fuel is force fed.
  • FIG. 5A corresponds to the normal control
  • FIG. 5B corresponds to the cylinder reduction control.
  • the lifting of the cam in the first pump 4 a and that in the second pump 4 b occur in reversed phase, as described before.
  • the pressure chambers 42 a of the pumps 4 a and 4 b are alternately expanded and contracted.
  • the PCVs 43 a and 43 b are closed at any times during the periods in which the cams are lifted, thereby fuel is force fed. It should be noted that energizing the PCVs 43 a , 43 b terminates in the middle of the fuel-feed period, as shown in FIG. 5A . This is because the PCVs 43 a , 43 b are outwardly-opening valves that are lifted toward the inside of the pressure chamber 402 a and kept closed while the fuel pressure in the pressure chamber 402 a is larger than a predetermined value.
  • the energization to the second PCV 43 b is not performed in the shown example.
  • the force fed fuel is performed only by the first pump 4 a .
  • the feed quantity by the first pump 4 a increases.
  • the feed quantity by the first pump 4 a in the cylinder reduction control is basically twice, and the closing time of the PCV 43 a occurs earlier.
  • the driving torque at the beginning of the cam lifting period is smaller than that at the end.
  • the force fed fuel is carried out at the early stage of the cam lifting period in which the driving torque is small, not near the end of the cam lifting period in which the driving torque is large.
  • the driving torque can be reduced.
  • energy consumption is reduced.
  • the driving torque can be reduced and energy consumption can be suppressed.
  • the cylinder reduction control is selected in the case where the injection quantity Q is equal to or smaller than its reference value QLMT and the injection-quantity change amount ⁇ Q is equal to or smaller than its reference value ⁇ QLMT.
  • This case corresponds to the operating state in which it is not necessary to use both the pumps 4 a and 4 b for the fuel feed and which can be regarded as a state in which a request for force fed fuel does not become strong rapidly because of sudden speed-up, i.e., the operating state in which the fuel feed request is weak at present and immediately after of the present time.
  • selection of the cylinder reduction control provides a large advantage.
  • the reference value QLMT is preferably set to an appropriate value for distinguishing an idling state and other states, for example. This is because in the idling state the request of forcedly feeding the fuel is not strong and is constant.
  • the cylinder reduction control is selected under condition where the injection-quantity change amount ⁇ Q is not larger than its reference value ⁇ QLMT.
  • the fuel feed request is relatively weak and the selection of the cylinder reduction control provides a large advantage, except for a case where the injection quantity of fuel increases because of resistance the vehicle receives on a sloped road or the like and, therefore, the fuel feed request is expected to increase.
  • FIG. 6 shows this transition control.
  • the solid line shows a control immediately after switching to the normal control and the broken line shows a control in which a certain time has passed after the switching. Since the switching to the normal control is made, the second PCV 43 b is energized, as shown in FIG. 6 .
  • transition control that changes a ratio of the feed quantity by the first pump 4 a and that by the second pump 4 b from the ratio in the cylinder reduction control in which the feed quantity by the second pump 4 b is zero so as to gradually increase the ratio of the feed quantity by the second pump 4 b , it is possible to prevent effects of rapid increase of the driving torque on the rotation of the engine, such as a shock on the engine.
  • Another transition control may be performed in the following manner, when the normal control is switched to the cylinder reduction control.
  • the feed quantity ratio of the first and second pumps 4 a and 4 b is set in such a manner the feed quantity by one of the pump (e.g., the first pump 4 a ) is larger than that by the other pump progressively, prior to stop the energization to one of the PCVs 43 a and 43 b .
  • the PCV 43 b of the other pump e.g., the second pump 4 b
  • the PCV 43 b of the other pump for which the fuel feed is thinned out is placed in a state in which the energization is stopped.
  • One of the transition controls performed when the normal control is switched to the cylinder reduction control and that performed when the cylinder reduction control is switched to the normal control may be omitted. If only one transition control is performed, it is preferable to perform the transition control when the cylinder reduction control is switched to the normal control. This is because this switching occurs in a direction in which the load on the engine increases. Moreover, depending on the required specification, both the transition controls can simply be omitted.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Controls For Constant Speed Travelling (AREA)
US11/038,440 2004-01-22 2005-01-21 Fuel supply device of an internal combustion engine Active US7017554B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2004-14377 2004-01-22
JP2004014377A JP4148145B2 (ja) 2004-01-22 2004-01-22 内燃機関の燃料供給装置

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US20050161024A1 US20050161024A1 (en) 2005-07-28
US7017554B2 true US7017554B2 (en) 2006-03-28

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US (1) US7017554B2 (zh)
EP (1) EP1557555B1 (zh)
JP (1) JP4148145B2 (zh)
CN (1) CN100365259C (zh)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7392793B2 (en) * 2006-03-27 2008-07-01 Denso Corporation Fuel injection controller
US20100192925A1 (en) * 2009-02-04 2010-08-05 Toyota Jidosha Kabushiki Kaisha Control device for internal combustion engine and control method for internal combustion engine
US20120145131A1 (en) * 2010-12-10 2012-06-14 Denso Corporation Fuel supply pump

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JP6421767B2 (ja) 2016-02-12 2018-11-14 株式会社デンソー 燃料ポンプの制御装置
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CN1644896A (zh) 2005-07-27
CN100365259C (zh) 2008-01-30
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EP1557555B1 (en) 2013-04-24
EP1557555A3 (en) 2011-09-21
US20050161024A1 (en) 2005-07-28

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